Actually, I want the annular region around the boundaries detected comprising at least the 9th immediate neighbour. So I have this mask obtained from nuclei segmentation and I want an annular region around each nuclei detected. Hope, I made it clearer.
Expanding boundary of an object identified by a few pixels
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I want to move boundaries of objects identified in an image by a few pixels within or without, so that I have uniformly expanded or shrunk object of almost the same shape. I was thinking of finding the neighbourhood of the pixels on the boundary and then take an appropriate union of them all - this might work for expanding the boundaries, but as of shrinking, I am not sure. Is there any other simpler way, which could work for both the things equally well?
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